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Idomura, Yasuhiro; Ina, Takuya*; Mayumi, Akie; Yamada, Susumu; Imamura, Toshiyuki*
Lecture Notes in Computer Science 10776, p.257 - 273, 2018/00
Times Cited Count：3 Percentile：45.87(Computer Science, Artificial Intelligence)A preconditioned Chebyshev basis communication-avoiding conjugate gradient method (P-CBCG) is applied to the pressure Poisson equation in a multiphase thermal-hydraulic CFD code JUPITER, and its computational performance and convergence properties are compared against a preconditioned conjugate gradient (P-CG) method and a preconditioned communication-avoiding conjugate gradient (P-CACG) method on the Oakforest-PACS, which consists of 8,208 KNLs. The P-CBCG method reduces the number of collective communications with keeping the robustness of convergence properties. Compared with the P-CACG method, an order of magnitude larger communication-avoiding steps are enabled by the improved robustness. It is shown that the P-CBCG method is 
and 
faster than the P-CG and P-CACG methods at 2,000 processors, respectively.
Yamada, Susumu; Imamura, Toshiyuki*; Machida, Masahiko
Lecture Notes in Computer Science 10776, p.243 - 256, 2018/00
Times Cited Count：1 Percentile：30.82(Computer Science, Artificial Intelligence)no abstracts in English
Onodera, Naoyuki; Idomura, Yasuhiro
Lecture Notes in Computer Science 10776, p.128 - 145, 2018/00
Times Cited Count：11 Percentile：82.55(Computer Science, Artificial Intelligence)We developed a CFD code based on the adaptive mesh-refined Lattice Boltzmann Method (AMR-LBM). The code is developed on the GPU-rich supercomputer TSUBAME3.0 at the Tokyo Tech, and the GPU kernel functions are tuned to achieve high performance on the Pascal GPU architecture. The performances of weak scaling from 1 nodes to 36 nodes are examined. The GPUs (NVIDIA TESLA P100) achieved more than 10 times higher node performance than that of CPUs (Broadwell).
Suzuki, Michiyo; Sakashita, Tetsuya; Tsuji, Toshio*; Kobayashi, Yasuhiko
Lecture Notes in Computer Science 6352, p.291 - 300, 2010/09
Hattori, Yuya; Suzuki, Michiyo; Soh, Zu*; Kobayashi, Yasuhiko; Tsuji, Toshio*
Lecture Notes in Computer Science 6352, p.401 - 410, 2010/09
Oka, Kiyoshi; Naganawa, Akihiro*; Yamashita, Hiromasa*; Nakamura, Tetsuya*; Chiba, Toshio*
Lecture Notes in Computer Science 5128, p.251 - 259, 2008/00
We present our new laser device for prospective human fetoplacental surgery including that of twin-twin transfusion syndrome. We developed acomposite-type optical fiberscope (2.2-mm in diameter) that enables transmission of 40-W Yb fiber laser light alongside of coaxial fetoscopic images. Using a laser condensing lens on the fiberscope tip, Yb fiber laser light can be focused 10-mm off. Using porcine liver tissue, despite changes in delivered laser energy, the diameter and depth of cauterized areas remained constant when the liver position agreed with the laser focal point, although the laser output altered the extent of tissue ablation. In conclusion, the performance of the fiberscope can be well controlled with accurate and efficient ablation of the target tissue. This Yb fiber laser fiberscope is expected to work much better if mounted on a miniature bending manipulator and if provided with additional functions (realtime distance and blood flow measurements).
Suzudo, Tomoaki
Lecture Notes in Computer Science 3305, p.151 - 160, 2004/00
This paper discuss a class of 2-dimensional asynchronous cellular automata with conservation of mass, for the formation of patterns in groups. The previous study reported a methodology of searching, automatically, for pattern-forming cellular automata using a genetic algorithm; this approach successfully found a few types of pattern-forming rules. The current study is a series of statistical analyses of one of the classes found by the above methodology, with the hope of understanding the mechanisms of the pattern formation. These analyses lead to some basic logic necessary to the pattern formation, but not to enough information to elucidate the whole mechanism of the pattern formation. This result suggests that the existence of unidentified cooperative operations between the different transitions of the cellular automaton rule to carry out the pattern formation.
Suzuki, Yoshio; Matsumoto, Nobuko*
Lecture Notes in Computer Science 2858, p.269 - 277, 2003/00
The Information-Technology-Based Laboratory (ITBL) project aims to build a virtual research environment for sharing intellectual resources such as remote computers, programs and data in research institutions and for supporting cooperative studies among researchers throughout Japan. The ITBL infrastructure software forms the basis of its ITBL framework. The application visualization system (AVS)/ITBL is one of core visualization systems on the ITBL system infrastructure software and has been developed based on the existing commercial visualization tool AVS/Express. The AVS/ITBL visualization system enables remote postprocessing visualization of any data stored on any supercomputer located in the ITBL network through Web browsers. In addition, a collaborative visualization function, which refers to researchers in remote locations simultaneously accessing and monitoring the same visualized image, has been developed based on the AVS/ITBL. The global structure as well as the performance of the AVS/ITBL is presented.
study of hydrogen hydrate clathrates for hydrogen storage within the ITBL environmentSluiter, M. H. F.*; Belosludov, R. V.*; Jain, A.*; Belosludov, V. R.*; Adachi, Hitoshi*; Kawazoe, Yoshiyuki*; Higuchi, Kenji; Otani, Takayuki
Lecture Notes in Computer Science 2858, p.330 - 341, 2003/00
Recently, for the first time a hydrate clathrate was discovered with hydrogen. Aside from the great technological promise that is inherent in storing hydorogen at high density at modest pressures, there is great scientefic interest as this would constitute the first hydrate clathrate with multiple guest molecules per cage. The multiple cage occupancy is controversial, and reproducibility of the experiments has been questioned. Therefore in this study we try to illucidate the remarkable stability of the hydrogen hydrate clathrate, and determine the thermodynamically most favored cage occpancy using highly accrate 
computer simulations in a parameter survey. To carry out these extraordinary demanding computations a distributed code has been developed using the SuperSINET with the ITBL software as the top-layer.
Higuchi, Kenji; Imamura, Toshiyuki*; Suzuki, Yoshio; Shimizu, Futoshi; Machida, Masahiko; Otani, Takayuki; Hasegawa, Yukihiro*; Yamagishi, Nobuhiro*; Kimura, Kazuyuki*; Aoyagi, Tetsuo; et al.
Lecture Notes in Computer Science 2858, p.245 - 257, 2003/00
Prototype of the middleware for Grid project promoted by national institutes in Japan has been developed. Key technologies that are indispensable for construction of virtual organization were already implemented onto the prototype of middleware and examined in practical computer/network system from a view point of availability. In addition several kinds of scientific applications are being executed on the prototype system. It seems that successful result in the implementation of those technologies such as security infrastructure, component programming and collaborative visualization in practical computer/network systems means significant progress in Science Grid in Japan.
Imamura, Toshiyuki*; Yamagishi, Nobuhiro*; Takemiya, Hiroshi*; Hasegawa, Yukihiro*; Higuchi, Kenji; Nakajima, Norihiro
Lecture Notes in Computer Science 2858, p.258 - 268, 2003/00
no abstracts in English
Imamura, Toshiyuki; Tsujita, Yuichi; Koide, Hiroshi; Takemiya, Hiroshi*
Lecture Notes in Computer Science 1908, p.200 - 207, 2000/00
no abstracts in English
Yokokawa, Mitsuo; ; ; ; Tani, Keiji;
Lecture Notes in Computer Science, 1615, p.269 - 280, 1999/00
no abstracts in English
